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Replace call to pred_motion() in direct spatial mv pred by code

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and simplify cases that cannot happen away.
8 cpu cycles faster

Originally committed as revision 21683 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-02-08 02:09:27 +00:00
parent b317567cf4
commit 35c8b9c094
1 changed files with 28 additions and 6 deletions
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34
libavcodec/h264_direct.c
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@ -30,7 +30,6 @@
#include "avcodec.h"
#include "mpegvideo.h"
#include "h264.h"
#include "h264_mvpred.h"
#include "rectangle.h"
//#undef NDEBUG
@ -225,14 +224,37 @@ single_col:
/* ref = min(neighbors) */
for(list=0; list<2; list++){
int refa = h->ref_cache[list][scan8[0] - 1];
int refb = h->ref_cache[list][scan8[0] - 8];
int left_ref = h->ref_cache[list][scan8[0] - 1];
int top_ref = h->ref_cache[list][scan8[0] - 8];
int refc = h->ref_cache[list][scan8[0] - 8 + 4];
if(refc == PART_NOT_AVAILABLE)
const int16_t *C= h->mv_cache[list][ scan8[0] - 8 + 4];
if(refc == PART_NOT_AVAILABLE){
refc = h->ref_cache[list][scan8[0] - 8 - 1];
ref[list] = FFMIN3((unsigned)refa, (unsigned)refb, (unsigned)refc);
C = h-> mv_cache[list][scan8[0] - 8 - 1];
}
ref[list] = FFMIN3((unsigned)left_ref, (unsigned)top_ref, (unsigned)refc);
if(ref[list] >= 0){
pred_motion(h, 0, 4, list, ref[list], &mv[list][0], &mv[list][1]);
//this is just pred_motion() but with the cases removed that cannot happen for direct blocks
const int16_t * const A= h->mv_cache[list][ scan8[0] - 1 ];
const int16_t * const B= h->mv_cache[list][ scan8[0] - 8 ];
int match_count= (left_ref==ref[list]) + (top_ref==ref[list]) + (refc==ref[list]);
if(match_count > 1){ //most common
mv[list][0]= mid_pred(A[0], B[0], C[0]);
mv[list][1]= mid_pred(A[1], B[1], C[1]);
}else {
assert(match_count==1);
if(left_ref==ref[list]){
mv[list][0]= A[0];
mv[list][1]= A[1];
}else if(top_ref==ref[list]){
mv[list][0]= B[0];
mv[list][1]= B[1];
}else{
mv[list][0]= C[0];
mv[list][1]= C[1];
}
}
}else{
int mask= ~(MB_TYPE_L0 << (2*list));
mv[list][0] = mv[list][1] = 0;